163 research outputs found
Necessity for quantum coherence of nondegeneracy in energy flow
In this work, we show that the quantum coherence among non-degenerate energy
subspaces (CANES) is essential for the energy flow in any quantum system. CANES
satisfies almost all of the requirements as a coherence measure, except that
the coherence within degenerate subspaces is explicitly eliminated.We show that
the energy of a system becomes frozen if and only if the corresponding CANES
vanishes, which is true regardless of the form of interaction with the
environment. However, CANES can remain zero even if the entanglement changes
over time. Furthermore, we show how the power of energy flow is bounded by the
value of CANES. An explicit relation connecting the variation of energy and
CANES is also presented. These results allow us to bound the generation of
system-environment correlation through the local measurement of the system's
energy flow
Always Strengthen Your Strengths: A Drift-Aware Incremental Learning Framework for CTR Prediction
Click-through rate (CTR) prediction is of great importance in recommendation
systems and online advertising platforms. When served in industrial scenarios,
the user-generated data observed by the CTR model typically arrives as a
stream. Streaming data has the characteristic that the underlying distribution
drifts over time and may recur. This can lead to catastrophic forgetting if the
model simply adapts to new data distribution all the time. Also, it's
inefficient to relearn distribution that has been occurred. Due to memory
constraints and diversity of data distributions in large-scale industrial
applications, conventional strategies for catastrophic forgetting such as
replay, parameter isolation, and knowledge distillation are difficult to be
deployed. In this work, we design a novel drift-aware incremental learning
framework based on ensemble learning to address catastrophic forgetting in CTR
prediction. With explicit error-based drift detection on streaming data, the
framework further strengthens well-adapted ensembles and freezes ensembles that
do not match the input distribution avoiding catastrophic interference. Both
evaluations on offline experiments and A/B test shows that our method
outperforms all baselines considered.Comment: This work has been accepted by SIGIR2
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